Cause : Incompatible option module comes when option module not supported. The fault code 7085 in your ABB ACS880 drive indicates an incompatible option module. This means the drive detected an issue with an optional module you've connected to it.

For example, type Fxxx-xx-M fieldbus adapter modules are not supported.

Check the auxiliary code. The code specifies the interface to which the unsupported module is connected:

1: Fieldbus interface A,

2: Fieldbus interface B. Replace the module with a supported type.

A - FSO-xx module is not supported by the control board.

Remove FSO-xx module to clear the fault.

Connect FSO-xx module to the supported control board.